3 ms·
A lot of the ZX Spectrum functionality and logic is in the ULA, an ASIC. There's a whole book on the ULA - http://www.zxdesign.info/book/theZXSpectrumULA.shtml
by jdmoreira 10y ago
A lot of the ZX Spectrum functionality and logic is in the ULA, an ASIC.
There's a whole book on the ULA - http://www.zxdesign.info/book/theZXSpectrumULA.shtml http://www.zxdesign.info/book/theZXSpectrumULA.shtml
- dfox 10y agoActually there is now design out of 74ls series logic that replicates functionality of the ULA (it is probably completely bug-for-bug compatible), IIRC it was designed by author of said book.